Point-to-Point Protocol (PPP) Support
Point-to-Point Protocol (PPP) is a data link layer (layer 2) communications protocol used to establish a direct connection between two nodes. PPP is used over many types of serial links since IP packets cannot be transmitted over a modem line on their own, without some data link protocol.
In Zephyr, each individual PPP link is modelled as a network interface. This is similar to how Linux implements PPP.
PPP support must be enabled at compile time by setting option
The PPP support in Zephyr 2.0 is still experimental and the implementation
supports only these protocols:
LCP (Link Control Protocol, RFC1661)
HDLC (High-level data link control, RFC1662)
IPCP (IP Control Protocol, RFC1332)
IPV6CP (IPv6 Control Protocol, RFC5072)
See also the samples/net/sockets/echo_server/overlay-ppp.conf file for configuration option examples. For using PPP with GSM modem, see Generic GSM Modem for additional information.
See the net-tools README file for more details on how to test the Zephyr PPP against pppd running in Linux.